| 2cy Caspian Gull / Larus cachinnans, Westkapelle - sea dike (The Netherlands) on 21 October 2007 |  |  |  |
Ringcode: 260P, ringed as pullus on 18 May 2007 at Żwirownia Zakole A, Jankowice, Babice (Poland)
Most of this gull looks like a 2cy Caspian Gull, even with a typical clear mirror on p10, but there are some features such as the fine dark streaking on the head, the extensively dark woolly streaking on the hind-neck, the shape of the head and the pattern on greater coverts (recalling Herring Gull), the median coverts and lesser coverts which is a bit atypical for Caspian Gull. Probably there's some influence from a Herring Gull or hybrid Caspian x Herring Gull. The problem is that we don't know enough about the plumage variation in pure Caspian Gulls and therefore we can not say for certain if a gull with these features is a pure Caspian Gull or if there's any influence from other large gull species.